Section 22: HEATING AND AIR CONDITIONING
PA1553
37
VAPOR-PRESSURE
TEMPERATURE PRESSURE
°F °C psi kPa
180 82.2 385.9 2660.8
190 87.8 433.6 2989.7
200 93.3 485.0 3344.1
210 98.9 540.3 3725.4
9.12 LEAK TESTING
Some methods such as nitrogen pressure and
soap, and electronic sniffer can be used for leak
testing. However, the most common method
used is a "Halide" torch consisting of an
acetylene tank, a burner and a suction test
hose. Proceed as follows:
DANGER
Do not inhale fumes from leak detector.
The flow of acetylene to the burner causes
suction in the test line. Any gas refrigerant
present will be drawn through the hose and into
the burner where it decomposes into free acids.
These acids come in contact with the hot copper
reaction plate in the burner, causing color
reaction in the flame. A small concentration is
indicated by a green tint and a large
concentration by an intense blue. Do not
confuse this change in color with the change
caused by shutting off the air supply through the
hose by holding the end too close to an object.
The procedure for testing is:
1. Adjust flame so that the top of the cone is
approximately level or within one-half inch
above the plate.
2. Probe end of suction test tube around all
joints, valves, etc. When a leak has been
found at a soldered joint, this section of the
system must be pumped down. Do not
solder as pressure will force hot solder out.
If the system is empty, it is more
economical to put in just enough R-134a to
produce about 15 psi (103 kPa). The
pressure can be raised to about 150 psi
(1034 kPa) with dry nitrogen.
NOTE
This gas is put into the suction and discharge
shutoff valves at the compressor. The receiver
valves must be opened. If no leaks are found,
dump this mixture, evacuate the system and
fill with refrigerant.
10. SMALL HVAC SYSTEM - AIR
CONDITIONING COMPONENTS
Small A/C system comes with a 6 cylinder, TM-
16HD Seltec compressor with an air conditioning
capacity of 2 tons.
10.1 COMPRESSOR
MODEL TM-16HD
TYPE Swash-plate type
Number of cylinders 6
Bore 36 mm (1.42”)
Stroke 26.7 mm (1.05”)
Displacement 163 cm³ (10cu.in)
Permissible speed 700-6000 rpm
Refrigerant HFC-134a
Lubricant ZXL100PG
180 cm³
Mass 4.9 kg (10.9 lbs)
10.2 MAGNETIC CLUTCH
TYPE Electromagnetic single-plate
dry clutch
Rated Voltage 24 volts DC
Current consumption 3.75 amperes (max)
Stalling torque 49 Nm (36.1 Lbf-ft) min.
Rotation CW/CCW
Mass 2.2 kg (4.9 lbs)
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